Patents
Literature
Patsnap Copilot is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Patsnap Copilot

2250 results about "Round bar" patented technology

High temperature composite fatigue loading method and apparatus for turbine disc/blade joggled joint

A turbine disc/blade tenon connection high-temperature combined fatigue loading device comprises a low cycle load stress application mechanism, a force transmission pin, a force transmission main tension plate, a force transmission crown plate, a force transmission round bar, a blade clamp, a rolling bearing, a hold-down bolt, a high cycle transmission plate, a high-frequency heating cycle, and a vibration generator, wherein, the low cycle load stress application mechanism is connected with the force transmission main tension plate through the force transmission pin; the force transmission main tension plate is connected with the force transmission round bar through the rolling bearing; the lower end of the force transmission crown plate is sleeved on the force transmission round bar, and the upper end is connected with the load bearing dummy club of the blade clamp through the rolling bearing; the blade clamp is connected with the blade of a turbine through the hold-down bolt; the turbine disc is connected with the low cycle load stress application mechanism through the force transmission pin; the high cycle transmission plate is connected with the blade clamp through the hold-down bolt; and the vibration generator is positioned on one side above a high cycle load transmission plate. The loading method is characterized in that the force application point of low cycle loads is moved backwards, thereby enabling small high cycle loads to be smoothly transferred to the tenon connection position, ensuring the stress distribution along the tenon tooth is reasonable, and preventing combined loads from interfering with each other.
Owner:BEIHANG UNIV

A kind of measuring device and method of thin film thermoelectric performance parameters

The invention provides a device and a method for measuring thermoelectric parameters of a film. The measuring device, which has a symmetric structure, comprises a radiating fin, a thermoelectric module, a heat insulation material, metal round rods, a thermocouple wire, a voltmeter, a power supply, a data acquisition instrument and a computer. The measuring method provided by the invention comprises the following steps of: clamping a film to be measured between two upper and lower metal round rods which are completely same while the area of the film sample is the same as the cross-sectional area of the metal round rods, controlling the ambient temperature of the measuring device and the heat flow of the film sample by the use of the thermoelectric module, detecting and recording each performance parameter of the film thermoelectric material at real time by the use of the data acquisition instrument. The invention has the following advantages: the performance of the film thermoelectric material at different temperatures can be measured, that is to say, the same device can be utilized to simultaneously measure the thermal conductivity coefficient, Seebeck coefficient and conductance coefficient of the film thermoelectric material so as to calculate ZT values of the film thermoelectric material at different temperatures. According to the invention, the measuring device has a simple principle, is convenient to operate, is small in size, has many test functions and has high measuring precision.
Owner:SHANGHAI UNIV

Bearing steel,method for evaluating large-sized inclusions in the steel and rolling bearing

A first object is to provide a method for evaluating large-sized inclusions in a bearing steel. The method enables quantitative evaluation of large-sized inclusions even if the steel has a high degree of cleanliness. Further, a second object is to provide an appropriate bearing steel evaluated by the method for evaluating large-sized inclusions. Further, a third object is to provide a rolling bearing capable of eliminating short life products and cracked products and providing longer lifetime for entire bearings. In order to achieve the first object, a round bar formed of a bearing steel to be evaluated and an ultrasonic probe are placed in an ultrasonic transmission medium, and the size and number of large-sized inclusions that are present in the flaw detection volume are measured to estimate the existence probability of large-sized inclusions in the bearing steel to be evaluated. The second object is achieved by specifying large-sized inclusions that are present in the bearing steel in accordance with the method for evaluating large-sized inclusions. Further, to achieve the third object, a rolling bearing is manufactured from a seamless steel tube, as material, having a diameter of 180 mm or less and a wall thickness of 25 mm or less, and ensured that it does not include a defect having a length of 1 mm of more at its material stage.
Owner:NSK LTD

Precision die forging and shaping technical method for automobile steering knuckle rough type parts

The invention provides a precision die forging and shaping technical method for automobile steering knuckle rough type parts. The precision die forging and shaping technical method mainly comprises the process steps of blanking, heating, extruding and drawing out a rod part, pre-forging, upsetting, performing material distribution and performing multi-way precision die forging and shaping and is specifically as follows: blanking through a cutting device, and heating to the temperature of 1080 DEG C-1180 DEG C in a medium-frequency induction furnace; placing a round bar which is well heated into a female die of an extruding and drawing-out die to form a stock comprising a cylindrical surface and a steering knuckle rough rod part; placing the stock after upsetting and material distribution into a multi-way die forging die, firstly enabling an upper male die and an upper die seat in the vertical direction to move downwards, and closing the upper male die and a lower female die for forging; and then using male dies on the symmetrical left side and right side in the horizontal direction to perform extrusion precision forging and shaping. According to the method provided by the invention, as the die forging is performed on a multi-way die forging hydraulic machine, the shaping speed is much lower than that of die forging on a hammer, thus the occurrence of the phenomenon of forming cracks on the surface due to strong speed sensitivity caused by too-high speed can be avoided; and the contact friction resistance between a forged piece and the surface of a die cavity during the processes of die forging, shaping and ejection of the forced piece can be greatly reduced, the surface quality of the forged piece is further improved, and the utilization rate of the material of the forged piece is improved.
Owner:CHONGQING UNIV OF TECH

High-temperature push-pull fatigue test clamp for hollow round rod test piece

The invention discloses a high-temperature push-pull fatigue test clamp for a hollow round rod test piece, wherein the hollow round rod test piece is cooled by an air flow inside during a high-temperature test, so that a required temperature gradient on the inner and outer wall surfaces of the hollow round rod test piece during the high-temperature test is realized; a hydraulic chuck of a fatigue machine clamps a light rod end of a joint and is connected with a connecting rod through a countersunk bolt; the connecting rod and a sleeve are fastened by virtue of a nut; the test piece is fastened into a test piece cover and the two are fastened into the sleeve together and are ejected by the hollow rod end of the connecting rod to eliminate the thread pitch; the cooling air flow from a compressor passes through the joint of a cooler, passes through the sleeve through a relatively large hole and enters into the inner cavity of the connecting rod so as to further enter into the hollow round rod test piece to enter into the test piece downward and to be discharged through a lower clamp. The clamp disclosed by the invention can be used for stably clamping the hollow round rod test pieces of various dimensions and uniaxial elongation and elongation/compression fatigue of the test piece under a high temperature condition is realized.
Owner:廊坊智驰动力科技有限公司

Solar-grade silicon wafer being cut by diamond wire and cutting method thereof

InactiveCN102390094AFast cutting speedSave silicon resourcesFine working devicesDiamond cuttingMicrometer
The invention discloses a solar-grade silicon wafer being cut by a diamond wire and a cutting method thereof. A mono-crystalline silicon square rod is cut by a diamond wire. The cutting method comprises the following steps that: the mono-crystalline silicon square rod which is formed by squaring, grinding and sharpening a mono-crystalline silicon circular rod, the mono-crystalline silicon square rod is fixed on a resin strip through an adhesive bar, the resin strip is fixed on an adhesive plate, then the adhesive plate and the mono-crystalline silicon square rod are collectively placed into a working cabin to be preheated, cutting liquid is circulated in the working cabin to work, then the diamond cutting is performed, the cut mono-crystalline silicon wafer is inversely arranged on a degumming device to degum, and the mono-crystalline silicon wafer is washed by ultrasonic and then is centrifugally dehydrated. Due to the adoption of the cutting method, the photoelectric conversion efficiency and the cutting efficiency of the mono-crystalline silicon wafer can be improved, a silicon wafer with the thickness of 140 to 200 micrometers can be produced, the qualification rate of the product can reach more than 98 percent; and silicon powder is recyclable, so valuable silicon resource can be saved, and the environment-friendly production can be really realized during the production process.
Owner:江西金葵能源科技有限公司

Low-temperature control rolling and splitting process method and device for ribbed steel bars

The invention discloses a low-temperature control rolling and splitting process method for ribbed steel bars. The method comprises the steps of (1), heating square billets to 960-1000 DEG C; (2), conveying the square billets to a rough rolling unit for rolling and rolling the square billets to form round bars; (3), after a first flying shear shears the heads and the tails of the round bars, conveying the round bars to an intermediate rolling unit to form rectangular bars; (4), after a second flying shear shears the heads and the tails of the rectangular bars, conveying the rectangular bars to a finish rolling unit for pre-splitting and rolling the rectangular bars to form rolled pieces shape like dog bones; (5), conveying the rolled pieces to a control rolling and through water cooling device for through water cooling; (6), after a third flying shear shears the heads and the tails of the rolled pieces, rolling the rolled pieces in the finish rolling unit to form a plurality of the independent ribbed steel bars; (7), conveying the ribbed steel bars to a post-rolling control cooling and through water cooling device for cooling; (8) conveying the ribbed steel bars to a multi-length flying shear for multi-length sectioning and then conveying the sectioned steel bars to a cooling bed. According to the invention, the production efficiency is greatly improved, and the economic benefits and social benefits are great because the rolling energy consumption is greatly lowered, the addition amount of alloy is greatly lowered and mine exploitation is greatly reduced.
Owner:SHANDONG SHIHENG SPECIAL STEEL GROUP

Key manufacturing technology of built-in type permanent magnet synchronous electric motor rotor

The invention relates to a key manufacturing technology of a built-in type permanent magnet synchronous electric motor rotor. An iron core overlying technology comprises the following steps: fixing adummy shaft, and sleeving the dummy shaft into a rotor baffle plate; sleeving arranged rotor sheets into the dummy shaft; inserting two stud bolts, and screwing nuts; then sequentially sleeving rotorsheets into the dummy shaft; installing the rotor baffle plate at the other side of the overlayed rotor sheet, and then fixing the rotor baffle plate; and overlying and firming the rotor sheets on a press machine. A permanent magnet assembling technology comprises the following steps: cleaning a permanent magnet groove, i.e. adding a groove cleaning technology, wherein a groove cleaning tool is asquare lead block, and the permanent magnet groove reaches a permanent magnet groove assembly requirement after being cleaned; marking the polarity of each permanent magnet; placing the permanent magnets into the permanent magnet groove of the rotor; pushing the permanent magnets to the bottom of the permanent magnet groove by a non-magnetic rigid round bar till the permanent magnet groove is filled with the permanent magnets; and pouring epoxy resin glue into the permanent magnet groove. The invention has simple and practical technology process and higher primary qualification rate of products and shortens the production period of the products.
Owner:SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP

Fitting structure of guide rail and furnace body of metal round bar heating furnace

InactiveCN102175086AThere will be no crowdingReduce work intensityCharge manipulationEngineeringHeating furnace
The invention relates to a fitting structure of a guide rail and a furnace body of a metal round bar heating furnace, belonging to the technical field of industrial kiln furnaces. The metal round bar heating furnace comprises the furnace body which is provided with a hearth. The fitting structure is characterized in that the hearth bottom wall of the hearth is provided with guide rail grooves at intervals; the guide rail grooves are in parallel with the length direction of the hearth; the guide rail is arranged in each guide rail groove; the guide rail comprises a guide rail seat, a connecting plate and a guiding bar which are mutually integrated into a structure; the guide rail seat is positioned at the bottom part of the connecting plate and is embedded with the guide rail grooves; the guiding bar is positioned at the top part of the connecting plate; the guide rail seat is provided with guide rail seat expansion grooves at intervals; the connecting plate is provided with first connecting plate expansion grooves at intervals; the first connecting plate expansion grooves are communicated with the guide rail seat expansion grooves; the guiding bar is provided with guiding bar expansion grooves at intervals; and the guiding bar expansion grooves and the first connecting plate expansion grooves are formed at intervals. The structure has the advantages that the heating efficiency is improved, energy sources are saved, uniform heating can be ensured, and the working intensity is relieved.
Owner:CHANGSHU FEIFAN METALWORK

Three-dimensional force sensor for minimally invasive surgery robot

The invention provides a three-dimensional force sensor for a minimally invasive surgery robot. The sensor is a sensor array consisting of eight strain gages; the sensor array is arranged at the periphery of a hollow metal round bar close to the tail end of a manipulator, and divided into two regions for measuring a radial force and an axial force of the round bar; four rectangular planes which are orthogonal to one another and used for installing strain gages are machined in the radial force measurement region; the opposite faces of the four strain gages form two half bridges; each half bridge outputs three signal wires; the signal wires enter the hollow metal round bar from a wire-leading hole, and are led out from the connecting end of the manipulator; two pairs of strain gages are arranged at opposite positions of the axial force measurement region; the four strain gages are symmetrically arranged so as to form a Poisson bridge; the Poisson bridge outputs four signal wires; and the signal wires enter the round bar from the wire-leading hole and are led out from the connecting end of the manipulator. A metal foil for electromagnetic shielding is covered at the peripheries of the strain gages. The three-dimensional force sensor for the minimally invasive surgery robot has a simple structure, high sensitivity and low cost, and is easy to machine.
Owner:NANKAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products